feat(utils)!: Remove @sentry/utils package

[andreiborza]

Closes: #14270

[Lms24]

Do we already have an entry in our migration guide draft? If not, let's add one

[andreiborza]

Do we already have an entry in our migration guide draft? If not, let's add one

There's this:

sentry-javascript/docs/migration/v8-to-v9.md

Lines 85 to 92 in 16647a5

	As part of an architectural cleanup we deprecated the following packages:
	- `@sentry/utils`
	- `@sentry/types`
	All of these packages exports and APIs have been moved into the `@sentry/core` package.
	The `@sentry/utils` package will no longer be published.

I thought that was enough, wdyt?